Afternoon All, > Hello Guys, > > I have an object which I save to the database using SQLAlchemy, the class is defined using > declarative and has a whole bunch of properties. > > This object has one property though which isn't saved to the database, but to the file system. > It is basically a binary string of a files contents. > > I essentially want to write this binary content to the file system when the record is created > in the database, and likewise, delete the file from the FS when the record is removed from the > database. > > I understand all the basics of writing a file, it's just a case of how to implement this into > the ORMified object. > > How would you handle this? Presumably it'll involve creating a couple of methods in the > class which handle the file save/delete process, but how do I tie these to the save/delete > methods of the ORM? And furthermore, are there any smart ways of making this > transactional so if either the database write fails or the file write fails then the > they are both rolledback so I don't end up with db records without files and files > without dbrecords? > > I'd really appreciate your thoughts on the cleanest way to implement this. > > Heston
I wanted to bump this topic as I'm still a little confused as to how it might implement. I've been doing a little reading this afternoon about mapper extensions, would this be a decent use of that do you think for after_create and after_delete? I really appreciate your input guys, being new to the ORM scene and a lonely programmer with no one to bounce ideas off this has got me baffled. Heston --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~----------~----~----~----~------~----~------~--~---
